A company runs a critical application on Amazon ECS using EC2 instances and plans to migrate it to ECS on AWS Fargate. A developer is configuring Fargate and ECS capacity providers to minimize downtime during migration. Which configuration will accomplish this with the least downtime?

The correct option uses PutClusterCapacityProviders to associate existing Fargate and Fargate Spot capacity providers with the ECS cluster. This is the appropriate API call for configuring capacity providers on an existing cluster. Setting Fargate as Provider 1 with a base value ensures that a minimum number of tasks always run on the more reliable Fargate On-Demand capacity, which is crucial for a critical application. Fargate Spot as Provider 2 acts as a failover or for scaling, leveraging cost savings when available. Incorrect options: CreateCapacityProvider is used to create new custom capacity providers, not to associate existing AWS-managed ones like Fargate and Fargate Spot. Setting Fargate Spot as Provider 1 for a critical application is risky because Spot instances can be interrupted, leading to potential downtime.